build: Fix missing ms function export

Windows def file was missing an exported ec support function.
Also added path in nmake file to build extra examples.

Change-Id: I59ac1599dcb8cdb45077347c74b57aeca4751c35
Signed-off-by: Greg Tucker <greg.b.tucker@intel.com>

Makefile.nmake

@@ -231,6 +231,9 @@ ex = \
 	ec_simple_example.exe \
 	ec_piggyback_example.exe
 
+{examples\ec}.c.obj:
+	$(CC) $(CFLAGS) /c -Fo$@ $?
+
 ex: lib $(ex)
 
 $(ex): $(@B).obj

isa-l.def

@@ -115,3 +115,4 @@ isal_gzip_header_init           @110
 isal_adler32                    @111
 isal_deflate_process_dict       @112
 isal_deflate_reset_dict         @113
+gf_inv                          @114

tools/gen_nmake.mk

@@ -55,6 +55,8 @@ ifneq (,$(examples))
 	@$(foreach ex, $(notdir $(examples)), printf " %s\n\t%s.exe" \\ $(ex) >> $@; )
 	@echo ''			>> $@
 	@echo ''			>> $@
+	@$(foreach d, $(subst /,\\, $(sort $(patsubst %/,%,$(filter examples/%,$(dir $(examples)))))), \
+		printf "{%s}.c.obj:\n\t\$$(CC) \$$(CFLAGS) /c -Fo\$$@ \$$?\n\n" $(d) >> $@; )
 	@echo 'ex: lib $$(ex)'		>> $@
 	@echo ''			>> $@
 	@echo '$$(ex): $$(@B).obj'	>> $@